I had a manager who's Monday Morning Meeting was a brainstorming session. Nobody's brain was working yet, and all we did was come up with ideas we couldn't implement, so it was a waste. That was frustrating.
Another manager's idea of the MMM was to get everyone in a room and check off what got done last week on a spreadsheet. And then check off what everyone was going to do on that week on a spreadsheet. A meeting was definitely not needed.
We've now got it down to 20 minutes or so to go over what's new, what we're working on. What we got done is ticked off in an app before the meeting. This seems to work nicely.